The Hello protocol discovers and maintains relationships with neighboring routers. Hello packets are periodically sent out to each router interface. The packet contains the RID of other routers whose hello packets have already been received over the interface.When a device sees its own RID in the hello packet generated by another router, these devices establish a neighbor relationship.The hello packet also contains the router priority, DR identifier, and BDR identifier. These parameters are used to elect the DR on multi-access networks.
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